Could you complete this code without adding any header file? Explain your code p
ID: 3597804 • Letter: C
Question
Could you complete this code without adding any header file?
Explain your code please(Like leave a comment on each loop and statement)
----------------------------------------------------------------------------------------------------------
#include <iostream>
#include <string>
using namespace std;
class BigInt {
private:
int* arr;
int size;
public:
// constructor with size and pointer to an array
BigInt(int s, int* a) {
size = s;
arr = a;
}
// this constructor should convert str into an array of ints,
// storing the values on the RIGHT SIDE of the array :)
BigInt(string str) {
size = str.length();
arr = new int [size];
for(int i = 0; i < size; i++) {
arr[i] = str[i] - '0';
}
}
// copy constructor
BigInt(const BigInt& other) {
size = other.getSize();
arr = new int [size];
for(int i = 0; i < size; i++) {
arr[i] = other[i];
}
}
// get the size of the array
int getSize() const {
return size;
}
// this function gets the digit at 'index' from arr
// and returns 0's if 'index' is negative
int operator [] (int index) const {
if(index >= 0) {
return arr[index];
} else {
return 0;
}
}
// this function should add the argument "num"
// to the private array and return the sum
BigInt operator + (BigInt num) {
}
// this function should subtract the argument "num"
// from the private array and return the difference
BigInt operator - (BigInt num) {
}
// this function will print the BigInt
void print() {
for(int i = 0; i < size; i++) {
cout << arr[i];
}
cout << endl;
}
};
int main() {
string str1, str2;
cout << "num 1: ";
cin >> str1;
cout << "num 2: ";
cin >> str2;
BigInt num1(str1);
BigInt num2(str2);
cout << endl;
cout << "num 1: ";
num1.print();
cout << "num 2: ";
num2.print();
cout << endl;
cout << "sum: ";
BigInt sum = num1 + num2;
sum.print();
cout << "difference: ";
BigInt diff = num1 - num2;
diff.print();
// pause and exit
getchar();
return 0;
}
Explanation / Answer
#include <iostream>
#include <string>
using namespace std;
class BigInt {
private:
int* arr;
int size;
public:
// constructor with size and pointer to an array
BigInt(int s, int* a) {
size = s;
arr = a;
}
// this constructor should convert str into an array of ints,
// storing the values on the RIGHT SIDE of the array :)
BigInt(string str) {
size = str.length();
arr = new int [size];
for(int i = 0; i < size; i++) {
arr[i] = str[i] - '0';
}
}
// copy constructor
BigInt(const BigInt& other) {
size = other.getSize();
arr = new int [size];
for(int i = 0; i < size; i++) {
arr[i] = other[i];
}
}
// get the size of the array
int getSize() const {
return size;
}
// this function gets the digit at 'index' from arr
// and returns 0's if 'index' is negative
int operator [] (int index) const {
if(index >= 0) {
return arr[index];
} else {
return 0;
}
}
// this function should add the argument "num"
// to the private array and return the sum
BigInt operator + (BigInt num) {
}
// this function should subtract the argument "num"
// from the private array and return the difference
BigInt operator - (BigInt num) {
}
// this function will print the BigInt
void print() {
for(int i = 0; i < size; i++) {
cout << arr[i];
}
cout << endl;
}
};
int main() {
string str1, str2;
cout << "num 1: ";
cin >> str1;
cout << "num 2: ";
cin >> str2;
BigInt num1(str1);
BigInt num2(str2);
cout << endl;
cout << "num 1: ";
num1.print();
cout << "num 2: ";
num2.print();
cout << endl;
cout << "sum: ";
BigInt sum = num1 + num2;
sum.print();
cout << "difference: ";
BigInt diff = num1 - num2;
diff.print();
// pause and exit
getchar();
return 0;
}
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